copolymer

Also known as a heteropolymer, a substance that is made
from two (or more) different monomers, which
usually undergo a condensation
reaction with the elimination of a simple molecule, such as ammonia
or water. A typical example is the condensation of 1,6-diaminohexane (hexamethylenediamine)
with hexanedioic acid (adipic acid) to form nylon 6,6.

The properties of a polymeric plastic can most easily be modified if it
is a copolymer of two or more different monomers, e.g., acrylonitrile-butadiene-styrene
copolymer (ABS). Varying the proportions of the component monomers can preselect
its properties.